﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace Gmmy.Utility.Extensions
{
    public static class StringExtension
    {

        /// <summary>
        /// 转换人民币大小金额
        /// </summary>
        /// <param name="num">金额</param>
        /// <returns>返回大写形式</returns>
        public static string CmycurD(this decimal num)
        {
            string str1 = "零壹贰叁肆伍陆柒捌玖";            //0-9所对应的汉字
            string str2 = "万仟佰拾亿仟佰拾万仟佰拾元角分"; //数字位所对应的汉字
            string str3 = "";    //从原num值中取出的值
            string str4 = "";    //数字的字符串形式
            string str5 = "";  //人民币大写金额形式
            int i;    //循环变量
            int j;    //num的值乘以100的字符串长度
            string ch1 = "";    //数字的汉语读法
            string ch2 = "";    //数字位的汉字读法
            int nzero = 0;  //用来计算连续的零值是几个
            int temp;            //从原num值中取出的值

            num = Math.Round(Math.Abs(num), 2);    //将num取绝对值并四舍五入取2位小数
            str4 = ((long)(num * 100)).ToString();        //将num乘100并转换成字符串形式
            j = str4.Length;      //找出最高位
            if (j > 15) { return "溢出"; }
            str2 = str2.Substring(15 - j);   //取出对应位数的str2的值。如：200.55,j为5所以str2=佰拾元角分

            //循环取出每一位需要转换的值
            for (i = 0; i < j; i++)
            {
                str3 = str4.Substring(i, 1);          //取出需转换的某一位的值
                temp = Convert.ToInt32(str3);      //转换为数字
                if (i != (j - 3) && i != (j - 7) && i != (j - 11) && i != (j - 15))
                {
                    //当所取位数不为元、万、亿、万亿上的数字时
                    if (str3 == "0")
                    {
                        ch1 = "";
                        ch2 = "";
                        nzero = nzero + 1;
                    }
                    else
                    {
                        if (str3 != "0" && nzero != 0)
                        {
                            ch1 = "零" + str1.Substring(temp * 1, 1);
                            ch2 = str2.Substring(i, 1);
                            nzero = 0;
                        }
                        else
                        {
                            ch1 = str1.Substring(temp * 1, 1);
                            ch2 = str2.Substring(i, 1);
                            nzero = 0;
                        }
                    }
                }
                else
                {
                    //该位是万亿，亿，万，元位等关键位
                    if (str3 != "0" && nzero != 0)
                    {
                        ch1 = "零" + str1.Substring(temp * 1, 1);
                        ch2 = str2.Substring(i, 1);
                        nzero = 0;
                    }
                    else
                    {
                        if (str3 != "0" && nzero == 0)
                        {
                            ch1 = str1.Substring(temp * 1, 1);
                            ch2 = str2.Substring(i, 1);
                            nzero = 0;
                        }
                        else
                        {
                            if (str3 == "0" && nzero >= 3)
                            {
                                ch1 = "";
                                ch2 = "";
                                nzero = nzero + 1;
                            }
                            else
                            {
                                if (j >= 11)
                                {
                                    ch1 = "";
                                    nzero = nzero + 1;
                                }
                                else
                                {
                                    ch1 = "";
                                    ch2 = str2.Substring(i, 1);
                                    nzero = nzero + 1;
                                }
                            }
                        }
                    }
                }
                if (i == (j - 11) || i == (j - 3))
                {
                    //如果该位是亿位或元位，则必须写上
                    ch2 = str2.Substring(i, 1);
                }
                str5 = str5 + ch1 + ch2;

                if (i == j - 1 && str3 == "0")
                {
                    //最后一位（分）为0时，加上“整”
                    str5 = str5 + '整';
                }
            }
            if (num == 0)
            {
                str5 = "零元整";
            }
            return str5;
        }
        public static string ToBase64(this string str)
        {
            try
            {
                Regex reg = new Regex(@"^\d+[.]?\d*$");
                if (!reg.IsMatch(str))
                    return str;
                return Convert.ToBase64String(Encoding.Default.GetBytes(str));
            }
            catch
            {
                return string.Empty;
            }
        }
        public static string UrlEncode(this string str)
        {
            return WebUtility.UrlEncode(str);
        }
        public static string UrlDecode(this string str)
        {
            return WebUtility.UrlDecode(str);
        }

        /// <summary>
        /// 移除字符中的数字
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string RemoveNumber(this string str)
        {
            string pattern = @"[0-9]";

            //var names = "zhang3,0李四，1杨剑，杨剑2，杨剑,李2浩,玛丽1";

            var result = Regex.Replace(str, pattern, string.Empty);
            return result;
        }

        /// <summary>
        /// 提取摘要，是否清除HTML代码 (完美版)
        /// </summary>
        /// <param name="content"></param>
        /// <param name="length"></param>
        /// <param name="stripHtml"></param>
        /// <returns></returns>
        public static string GetContentSummary(this string content, int length, bool stripHtml = true)
        {
            if (string.IsNullOrEmpty(content) || length == 0)
                return "";
            if (stripHtml)
            {
                Regex re = new Regex("<[^>]*>");
                content = re.Replace(content, "");
                content = content.Replace("　", "").Replace(" ", "");
                if (content.Length <= length)
                    return content;
                else
                    return content.Substring(0, length) + "……";
            }
            else
            {
                if (content.Length <= length)
                    return content;

                int pos = 0, npos = 0, size = 0;
                bool firststop = false, notr = false, noli = false;
                StringBuilder sb = new StringBuilder();
                while (true)
                {
                    if (pos >= content.Length)
                        break;
                    string cur = content.Substring(pos, 1);
                    if (cur == "<")
                    {
                        string next = content.Substring(pos + 1, 3).ToLower();
                        if (next.IndexOf("p") == 0 && next.IndexOf("pre") != 0)
                        {
                            npos = content.IndexOf(">", pos) + 1;
                        }
                        else if (next.IndexOf("/p") == 0 && next.IndexOf("/pr") != 0)
                        {
                            npos = content.IndexOf(">", pos) + 1;
                            if (size < length)
                                sb.Append("<br/>");
                        }
                        else if (next.IndexOf("br") == 0)
                        {
                            npos = content.IndexOf(">", pos) + 1;
                            if (size < length)
                                sb.Append("<br/>");
                        }
                        else if (next.IndexOf("img") == 0)
                        {
                            npos = content.IndexOf(">", pos) + 1;
                            if (size < length)
                            {
                                sb.Append(content.Substring(pos, npos - pos));
                                size += npos - pos + 1;
                            }
                        }
                        else if (next.IndexOf("li") == 0 || next.IndexOf("/li") == 0)
                        {
                            npos = content.IndexOf(">", pos) + 1;
                            if (size < length)
                            {
                                sb.Append(content.Substring(pos, npos - pos));
                            }
                            else
                            {
                                if (!noli && next.IndexOf("/li") == 0)
                                {
                                    sb.Append(content.Substring(pos, npos - pos));
                                    noli = true;
                                }
                            }
                        }
                        else if (next.IndexOf("tr") == 0 || next.IndexOf("/tr") == 0)
                        {
                            npos = content.IndexOf(">", pos) + 1;
                            if (size < length)
                            {
                                sb.Append(content.Substring(pos, npos - pos));
                            }
                            else
                            {
                                if (!notr && next.IndexOf("/tr") == 0)
                                {
                                    sb.Append(content.Substring(pos, npos - pos));
                                    notr = true;
                                }
                            }
                        }
                        else if (next.IndexOf("td") == 0 || next.IndexOf("/td") == 0)
                        {
                            npos = content.IndexOf(">", pos) + 1;
                            if (size < length)
                            {
                                sb.Append(content.Substring(pos, npos - pos));
                            }
                            else
                            {
                                if (!notr)
                                {
                                    sb.Append(content.Substring(pos, npos - pos));
                                }
                            }
                        }
                        else
                        {
                            npos = content.IndexOf(">", pos) + 1;
                            sb.Append(content.Substring(pos, npos - pos));
                        }
                        if (npos <= pos)
                            npos = pos + 1;
                        pos = npos;
                    }
                    else
                    {
                        if (size < length)
                        {
                            sb.Append(cur);
                            size++;
                        }
                        else
                        {
                            if (!firststop)
                            {
                                sb.Append("……");
                                firststop = true;
                            }
                        }
                        pos++;
                    }

                }
                return sb.ToString();
            }
        }

        /// <summary>
        /// 将字符串转为骆驼命名法
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string ReplaceCamelString(this string str)
        {
            if (string.IsNullOrWhiteSpace(str))
            {
                return "";
            }
            if (str == "ID")
            {
                return "id";
            }
            var c = str.ToCharArray().FirstOrDefault();
            if (c > 'A' && c < 'Z')
            {
                return c.ToString().ToLower() + str.Substring(1, str.Length - 1);
            }
            return str;
        }
    }
}
